66569378808 has 64 divisors (see below), whose sum is σ = 166860000000. Its totient is φ = 22131667712.

The previous prime is 66569378797. The next prime is 66569378831. The reversal of 66569378808 is 80887396566.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22195693 + ... + 22198691.

It is an arithmetic number, because the mean of its divisors is an integer number (2607187500).

Almost surely, 2^66569378808 is an apocalyptic number.

It is an amenable number.

66569378808 is an abundant number, since it is smaller than the sum of its proper divisors (100290621192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66569378808 is a wasteful number, since it uses less digits than its factorization.

66569378808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5124 (or 5120 counting only the distinct ones).

The product of its (nonzero) digits is 104509440, while the sum is 66.

The spelling of 66569378808 in words is "sixty-six billion, five hundred sixty-nine million, three hundred seventy-eight thousand, eight hundred eight".